Assig-noe to himself



@uiten Afaire @anni ffittv MASON C. AMES, OF HARTFORD, CONNECTICUT, ASSIGNOR'TO HIMSEIJF AND JlilItElidYv W. BLISS, OF SAME PLA-CE.l

Letters Patent No. 70,937, dated Novemer 19, 1867.

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TO ALL WHOM IT MAY CONCERN:

Be it known that I, MASON C. AMES, of Hartford, county o'f Hertford, and State ofv Connecticut, have invented certain new and usefulImprovement in Carpenters Gauges; and to enableothers skilled in the art to make the same, I will proceed to describe by referring to the drawings, in which the same letters indicate like parts in each of the figures. A

The nature of this invention will be understood from the specification and drawings.

The object desired to be attained thereby is to produce a gauge adaptedfor concave and convex circles, and straight work.

Hitherto gauges have been made, having their heads perforated to receive a tooth-bar; this head being moved back and forward upon said bar, and secured at any fixed point, by means 4of a. wood or metal thumbscrew. This style of gauge does not meet the requirements for circular work; hence this improvement. In'the accompanying drawings- I v y ,Il Figure 1 is a side view of a gauge.

Figure 2 is an edge'view of a gauge.

Letters A B C D E are detached portions of a gauge. A is a gauge-bar, made in one or more pieces ofwood, or other suitable material, and is provided with a slit, a, through which the clamp-screw passes, to hold the head in its proper place. One or -both ends of this bar are provided with gauge-teeth a. B is a. gauge-head, having two straight edges c c; one concaveshape, d, and one convex Shape, d. It is also provided with two depressions e e', one at right angles with the other. These depressions are formed to receive the side of the bar A, and allow it to work closely and. freely therein, Through the centre of this head -is provided a hole-for the reception of the clampingbolt. .C is a clampingbolt, which is first driven into the hole of the head from the back side, so that the square portion z' thereof will secure itself closely therein. D is a washer, which isplacefl on the bolt, and against the sideV of the bar A. E is a thumb-nut, which is fitted on to the holt C, and the head is tightened or loosened upon the bar thereby, as desirable.

Now, it will be readily seen that when it is desirable to use a gauge on the outside or on the inside of a circle, it is only necessary to slacken the thumb-nut, so as to allow the head to be turned (a quarter turn) from its present depression e; thus always being in readiness to use either on straight or curved work'..

'I believe I have thus shown the nature, construction, and advantage of this improvement, so as to enable a person skilled in the art to make and use the same therefrom.-

What I claim, therefore, and desire to secure by Letters Patent, is-

As a new improved article of manufacture, a carpenters gauge, composed of the har A, head B, clampscrew C, and constructed to operate substantially as and for the purpose described.

MASON C. AMES. [1.. s]

Witnesses 4 Tnos. G. KNIGHT, HUBERT C. HART. 

